How To: Mk5 Heated Seats Retrofit

[xxk]

Anyone on this thread able to help with some issues I've had when retrofitting?

[xxk]

Just adding I've made another thread and have updated today with what I've done etc

https://www.mk5golfgti.co.uk/forum/index.php/topic,133985.0.html

[Golf5FSI]

Hello community,

Sorry to revive this old thread.
I have early Golf 1.6 FSi 2004 LHD with standard manual heated seats from fabric.
Recently got leather heated seats where driver seat is electric and both seats have electrical lumbal support from Golf GT 2008 LHD.

Everythings works (electric movement driver seat, lumbal support on both seats, driver seat heating) except passager side heating.
Electric movement for driver seat and lumbal support is fixed with additional 2.5 mm2 wire direct to SC34 with 20A.
Electric lumbal support for passenger seat is fixed by reusing old wire for seat heating since is kl30 (SC37) and can't be used for heating anymore (+2007 seats).

Seat heating - passager seat - issue:
Added additional 2.5 mm2 wire and connect pin10 in both seat connectors.
Problem is that I have +12v power for only first 2mins on Pin10 after IgnON.
When 2mins is pass, there is no power anymore and no heating on passager seat. Heating on driver side working normally.
Thought maybe was controller (relay 1Z0959772) under driver seat, tested with two others (1K0959772 and 5K0959772) and result is same.

Borrowed constant +12v (Kl.30) from lumbal support to Pin10 on passenger seat, now heating is working, but discharges battery overnight.

Did I miss something?
What controls time for relay Pin10?

Maybe elegant solution is to connect Pin10 on the passenger seat direct to fuse box and get +12v from ACC (Kl.15, SC31 spare place) which will avoid battery discharge ?

Thank you in advance !

[Golf5FSI]

UPDATE:

I have managed to fix it, after I put some time and study schemas from "jason_rmh" in post nr1 of this thread 

1. I have joined together pin2 and pin4 passenger on heat seat connector on the passenger side. I have used new wire and put in pin2 and crimped with pin4 together using "U" type terminal between seat and female connector.
With this I have achieved direct connection between pin4 on both seats and connection to HVAC module.

2. Removed fuse SC4 (kl15) from fuse box and leave only SC46 (kl15).
With this I have removed +12v from pin4 which disturbs signal from HVAC module, while HVAC module got separately +12v via SC46 (kl15).

No error is system. Heating works now as should on both seats.
Only thing to have full Feng Shui, is to find where is spliced SC4 (kl15) with pin4 wire originally and remove join leaving pin4 connections without voltage.